diff --git a/tests/IntegrationTest.php b/tests/IntegrationTest.php
index 55c0357..b1f7b69 100644
--- a/tests/IntegrationTest.php
+++ b/tests/IntegrationTest.php
@@ -38,6 +38,8 @@ public function testPingCtorWithExplicitUnixUrlSendsRequestToGivenUnixSocket()
         unlink($path);
 
         $this->assertEquals('/_ping', $value);
+
+        $socket->close();
     }
 
     public function testPingCtorWithExplicitHttpUrlSendsRequestToGivenHttpUrlWithBase()
@@ -58,5 +60,7 @@ public function testPingCtorWithExplicitHttpUrlSendsRequestToGivenHttpUrlWithBas
         $value = \Clue\React\Block\await($deferred->promise(), $loop, 1.0);
 
         $this->assertEquals('/base/_ping', $value);
+
+        $socket->close();
     }
 }